Abstract:
본 발명은 압축기 슬라이딩부의 내마모성을 향상시키고 장기간 안정된 운전을 보증할 수 있고, HFC 냉매하에서 사용가능한 밀폐형 압축기에 관한 것으로, 밀폐케이스(11)내에 전동기(12)와 압축기계(14)를 수용하고 이 압축기계(13)에서 압축되는 냉매에 HFC 냉매를 사용한 밀폐형 압축기(10)에 있어서 상기 압축기의 슬라이딩부를 윤활하는 냉동기유(30)에 4가 이상의 에스테르유를 사용하고 상기 압축기 슬라이딩부로를 구성하는 한쪽의 슬라이딩부재로는 알루미늄을 모재로하여 표면을 알루마이트처리한 것을, 다른쪽의 슬라이딩부재에 탄소강등의 금속재료를 각각 사용한 것을 특징으로 한다.
Abstract:
A piston type compressor has a housing, a cylinder block and a piston. The cylinder block is fixed to the housing. The piston is accommodated in the cylinder block. A piston ring is provided between the cylinder block and the piston. A sealing coat is made of soft metal, and is provided between the piston ring and the piston.
Abstract:
A compressor for use with an HFC refrigerant, comprising:
a sealed casing; a motor housed within the sealed casing; compression machinery also housed within the sealed casing, the compression machinery including a shaft made of globular graphite cast iron having a ferrite ratio of not more than 40%, or a shaft made of flaky graphite cast iron having a ferrite ratio of not more than 15%, and a bearing rotatably supporting the shaft and made of a graphite cast iron bearing material; and an at least tetravalent ester oil for the refrigerating machine oil which lubricates the shaft and the bearing.
Abstract:
An aluminium or aluminium alloy surface which during use is exposed to sliding friction has a chemical conversion coating of mostly tin with 0.2-10.0 wt. % cobalt and 0.1 to 12 wt. % bismuth. For example, a swashplate (20) of a swashplate type compressor may be conversion coated on at least part thereof, that is the part that during use contact the shoes. Preferably, the coating is between 0.8 to 2.5 microns thick. The coating (30) on the swash plate permits the use of low silicon alloy aluminium without the need of metal plating or high finish polishing.
Abstract:
A compressor is provided with cylinder blocks (30, 31) having cylinder bores (41, 42). A driving shaft (39) is supported rotatably on the cylinder blocks (30, 31). A swash plate (40) is fixed to the driving shaft (39) so that the swash plate can be rotated unitarily with the shaft. A piston (1) is held slidably in the cylinder bores (41, 42). Shoes (44) are provided slidably between the piston (1) and swash plate (40). The rotation of the swash plate (40) causes the shoes to reciprocate the piston. The piston (1) comprises aluminum or an aluminum alloy as a base material. The piston (1) is provided with recesses (2) for retaining the shoes (44) slidably. The retaining recesses (2) are provided with a covering layer (6) formed out of tin as a main component.
Abstract:
A swash plate type compressor that provides long lasting high lubricating performance to the sliding contact surfaces of a swash plate end shoes. The surface of the swash plate or the shoes on which the swash plate comes in sliding contact with the shoes is provided with an alloy plating layer, in which tin is the main component, as a surface treating layer. An coating layer, in which molybdenum disulfide is the main component, is formed as a solid lubricant layer on the foregoing plating layer. Preferably, the swash plate is made of aluminum or an aluminum alloy, and its surface is provided with the plating layer and the coating layer. More preferably, the coating layer contains graphite.
Abstract:
The compressor has cylinder blocks (30, 31) containing cylinder bores (41, 42). A drive shaft (39) is rotatably supported in the cylinder blocks (30, 31). A swash plate (40) is attached to the drive shaft (39) to be rotatable integrally therewith. A piston (1) is slidably housed in the cylinder bores (41, 42). A shoe (44) is slidably interposed between the piston (1) and the swash plate (40). As the swash plate (40) rotates, the piston (1) is reciprocated via the shoe (44). The piston (1) is made of an aluminum or aluminum alloy matrix. The piston (1) contains a receiving recess (2) for slidably receiving the shoe (44) therein. A coating layer (6) containing tin as a major component is formed at the receiving recess (2) of the piston (1).
Abstract:
The invention relates to a pumping system (12) for supercritical extraction comprising: inlet means adapted to be connected to a source of supercritical fluid; outlet means adapted to provide the pumped fluid to a pressure vessel (18 and 24A); and pumphead means (300) having a pumping chamber (336) communicating with said inlet means and with said outlet means; a piston (304); an inlet valve means controlling the flow of fluid into said pumping chamber (336) means through said inlet means; an outlet valve means controlling the flow of fluid from said pumping chamber means (336) through said outlet means; an inlet conduit means defining a flow path between said inlet valve and said pump chamber (336); and an outlet conduit means defining a flow path between said pump chamber (336) and said outlet valve means; characterized by an air-cooled thermoelectric-cooled heat exchanger means (386) for cooling both the inlet means and the pumphead means (300).